diff options
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power7/strncmp.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power7/strncmp.S | 55 |
1 files changed, 40 insertions, 15 deletions
diff --git a/sysdeps/powerpc/powerpc32/power7/strncmp.S b/sysdeps/powerpc/powerpc32/power7/strncmp.S index fdae44d265..10c9d251b0 100644 --- a/sysdeps/powerpc/powerpc32/power7/strncmp.S +++ b/sysdeps/powerpc/powerpc32/power7/strncmp.S @@ -26,7 +26,7 @@ EALIGN (strncmp,5,0) -#define rTMP r0 +#define rTMP2 r0 #define rRTN r3 #define rSTR1 r3 /* first string arg */ #define rSTR2 r4 /* second string arg */ @@ -39,6 +39,7 @@ EALIGN (strncmp,5,0) #define r7F7F r9 /* constant 0x7f7f7f7f */ #define rNEG r10 /* ~(word in s1 | 0x7f7f7f7f) */ #define rBITDIF r11 /* bits that differ in s1 & s2 words */ +#define rTMP r12 dcbt 0,rSTR1 nop @@ -78,13 +79,45 @@ L(g1): add rTMP,rFEFE,rWORD1 /* OK. We've hit the end of the string. We need to be careful that we don't compare two strings as different because of gunk beyond the end of the strings... */ +#ifdef __LITTLE_ENDIAN__ +L(endstring): + slwi rTMP, rTMP, 1 + addi rTMP2, rTMP, -1 + andc rTMP2, rTMP2, rTMP + and rWORD2, rWORD2, rTMP2 /* Mask off gunk. */ + and rWORD1, rWORD1, rTMP2 + rlwinm rTMP2, rWORD2, 8, 0xffffffff /* Byte reverse word. */ + rlwinm rTMP, rWORD1, 8, 0xffffffff + rldimi rTMP2, rWORD2, 24, 32 + rldimi rTMP, rWORD1, 24, 32 + rlwimi rTMP2, rWORD2, 24, 16, 23 + rlwimi rTMP, rWORD1, 24, 16, 23 + xor. rBITDIF, rTMP, rTMP2 + sub rRTN, rTMP, rTMP2 + bgelr + ori rRTN, rTMP2, 1 + blr + +L(different): + lwz rWORD1, -4(rSTR1) + rlwinm rTMP2, rWORD2, 8, 0xffffffff /* Byte reverse word. */ + rlwinm rTMP, rWORD1, 8, 0xffffffff + rldimi rTMP2, rWORD2, 24, 32 + rldimi rTMP, rWORD1, 24, 32 + rlwimi rTMP2, rWORD2, 24, 16, 23 + rlwimi rTMP, rWORD1, 24, 16, 23 + xor. rBITDIF, rTMP, rTMP2 + sub rRTN, rTMP, rTMP2 + bgelr + ori rRTN, rTMP2, 1 + blr +#else L(endstring): and rTMP,r7F7F,rWORD1 beq cr1,L(equal) add rTMP,rTMP,r7F7F xor. rBITDIF,rWORD1,rWORD2 - andc rNEG,rNEG,rTMP blt L(highbit) cntlzw rBITDIF,rBITDIF @@ -92,28 +125,20 @@ L(endstring): addi rNEG,rNEG,7 cmpw cr1,rNEG,rBITDIF sub rRTN,rWORD1,rWORD2 - blt cr1,L(equal) - srawi rRTN,rRTN,31 - ori rRTN,rRTN,1 - blr + bgelr cr1 L(equal): li rRTN,0 blr L(different): - lwzu rWORD1,-4(rSTR1) + lwz rWORD1,-4(rSTR1) xor. rBITDIF,rWORD1,rWORD2 sub rRTN,rWORD1,rWORD2 - blt L(highbit) - srawi rRTN,rRTN,31 - ori rRTN,rRTN,1 - blr + bgelr L(highbit): - srwi rWORD2,rWORD2,24 - srwi rWORD1,rWORD1,24 - sub rRTN,rWORD1,rWORD2 + ori rRTN, rWORD2, 1 blr - +#endif /* Oh well. In this case, we just do a byte-by-byte comparison. */ .align 4 |